2002.05.25 00:55 "Re: How multipage is stored", by Tore Bostrup

...And if I'm not mistaken, each subsequent IFD represents another page if
the NewSubfileType tag (254 or FE) has a value of 2. The first IFD is
always a full-resolution image, i.e. the first page.
HTH,
Tore.